I'm not sure that this is a hardware problem.
My new laptop:
Intel Core 2 Duo 2.0 ghz
x1600 mobile radeon
2g ddr2 5300
Girlfriends laptop:
AMD Athlon 1.8ghz
x700 mobile radeon
1g of ?
We both play world of warcraft.. (closet gamers) sshhh
It isn't a very graphics intensive game by any means...